WO2002095619A2 - Procede destine a optimiser l'utilisation d'une capacite client - Google Patents

Procede destine a optimiser l'utilisation d'une capacite client Download PDF

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Publication number
WO2002095619A2
WO2002095619A2 PCT/EP2002/005006 EP0205006W WO02095619A2 WO 2002095619 A2 WO2002095619 A2 WO 2002095619A2 EP 0205006 W EP0205006 W EP 0205006W WO 02095619 A2 WO02095619 A2 WO 02095619A2
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WO
WIPO (PCT)
Prior art keywords
subjects
client
navigation
user
subject
Prior art date
Application number
PCT/EP2002/005006
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English (en)
Other versions
WO2002095619A3 (fr
Inventor
Konstantin Zervas
Tomas Aronsson
Original Assignee
Mediabricks Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mediabricks Ab filed Critical Mediabricks Ab
Priority to KR1020037015227A priority Critical patent/KR100948446B1/ko
Priority to US10/478,366 priority patent/US7743344B2/en
Priority to JP2002592011A priority patent/JP2005513589A/ja
Publication of WO2002095619A2 publication Critical patent/WO2002095619A2/fr
Publication of WO2002095619A3 publication Critical patent/WO2002095619A3/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/10—Services
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/95—Retrieval from the web
    • G06F16/957—Browsing optimisation, e.g. caching or content distillation
    • G06F16/9574—Browsing optimisation, e.g. caching or content distillation of access to content, e.g. by caching

Definitions

  • the present invention is related to a method for optimizing utilization of client capacity when providing media contents to a user. More specifically, the present invention is concerned with how to cache data at a client when consuming media for improving the media experience when the bandwidth is limited.
  • client capacity including for example memory capacity, processing capacity, interface capacity etc.
  • caching especially when the bandwidth is limited.
  • the definition of limited bandwidth depends on the media. For example, video sent over Internet today has limitations, while text is practically without limits, as the download time is usually negligible compared to the time required reading it . Even though the main focus in this text is on mobile devices like phones or PDAs the same techniques could be used at higher bandwidths for other types of media.
  • the user downloads and stores (caches) a package comprising several media clips, and then navigates among these clips. No Internet connection is required during consumption, as the entire package, with all its media contents, is downloaded and stored in the handheld device. On the other hand, the media experience will be limited to the contents of the downloaded package. It is costly to include extensive media contents, especially if the download is over a mobile communication link.
  • the user receives a continuous stream of media, equivalent to listening to a CD or a radio station.
  • the client is adapted to download one single media clip, and playback this clip during download.
  • the simultaneous playback and download is accomplished by caching in the clients memory, and requires an uninterrupted internet connection, preferably a wide band connection.
  • the user has limited ways to control the media experience, at best a one dimensional navigation, i.e. stop, play, back and fast forward.
  • web browsing may be implemented in for example a WAP-telephone or a GPRS-or UMTS-device, connected continuously to a network. While providing the user with a dynamic media experience, browsing has the drawback that contents are only downloaded and cached when the user request them, leading to disturbing delays.
  • An accessed web page
  • the intelligent download concept overcomes the above problem by downloading media contents surrounding the user's current location in a media package structure. Thereby, the user will find himself surrounded by cached media contents, with practically no access time delay.
  • This "dynamic" caching is implemented, there is a problem regarding how to select the media contents to be cached in an optimal way.
  • the client memory is normally restricted, and more importantly, the time required to download the media contents must be inferior to the time required by the user to consume the current article, video clip etc.
  • dynamic caching it is necessary to in some way predict the actions of the user. This can be done quite successfully as long as the user remains restricted by the media package structure, but for a satisfying media experience, it is not desired to have the user restricted in this way.
  • a first object of the invention is to provide an optimal utilization of client capacity, such as processing capacity or caching capacity.
  • a second object is to provide a method for providing media contents, enabling the user to have a satisfying media experience, with a minimum of interruptions.
  • this and other objects are achieved by defining two modes of navigation of the client, a first, continuous navigation mode, characterized by restricted movement among the contents, and a second, discontinuous mode, characterized by unrestricted movement among the contents, determining which mode of navigation the user is currently using, and adapting the utilization of client capacity on the currently used mode of navigation.
  • the invention is based on the fact that client capacity should be utilized differently depending on how the user navigates among the media contents.
  • client capacity In the first mode of navigation, user action can be more easily anticipated, and the client capacity can be used for improving the ongoing media consumption.
  • client capacity In the second mode of navigation, user action is more difficult to predict, and client capacity may be needed for handling unexpected actions.
  • the need for memory is significantly reduced if the application can monitor which mode of navigation a user is using. If e.g. the user is scrolling in a predefined list of objects, less virtual memory is required compared to when a user makes arbitrary requests.
  • the client comprises a pointing device, such as a mouse or pen, for enabling the second mode of navigation, in which case the step of determining navigation mode can comprise determining when said pointing device is activated.
  • a pointing device such as a mouse or pen
  • the step of determining navigation mode can comprise determining when said pointing device is activated.
  • Most PDA:s comprise a combination of navigation buttons, for mode one navigation, and a pointing device for mode two navigation. When the user activates the pointing device, he is less likely to use the navigation buttons.
  • Activation of the pointing device can be e.g. removal of the same from a cradle or holder, in which case the client preferably comprises a sensor for determining the position of the pointing device.
  • the media contents are contained as subjects in a media structure in which a user can navigate in order to consume said subjects, only a portion of all subjects contained in the structure being cached at the client.
  • the first navigation mode is then characterized by movement between subjects being located adjacent in the structure, and the second navigation mode is characterized by movement between arbitrary subjects.
  • the step of adapting utilization of client capacity comprises predicting which subjects the user is more likely to navigate to, and caching these subjects in the client thereby providing dynamic caching of media contents on a client.
  • the information about how the user navigates is thus allowed to influence which subjects that should be cached, and this dynamic caching significantly improves the media experience.
  • the cost in terms of network usage for a satisfying media experience is reduced.
  • Fig 1 shows an example of a handheld mobile device, suitable for implementation of the present invention.
  • Fig 2 shows an example of a magazine structure according to the preferred embodiment of the invention.
  • Fig 3 shows a time line of consumption time vs. download times.
  • Fig 4 shows a flowchart of a caching procedure according to the preferred embodiment of the invention.
  • Fig 5 shows a flowchart of a caching out procedure according to the preferred embodiment of the invention.
  • the currently preferred embodiment is related to the concept of Mediabricks' TM magazines. This should not be regarded as a limitation to the scope of the appended claims, but only as an example of a situation where the present invention may be implemented successfully.
  • the client is assumed to be a handheld mobile communication device with media playback functionality, such as the PDA 1 illustrated in fig 1. Definitions
  • Media subject a piece of media contents, further organized in different layers. Each subject can have audio, video, images, text etc.
  • Magazine a collection of media subjects, organized in a defined media package structure.
  • the user should be able to consume the subjects in the structure without having to wait for new subjects to be downloaded to the mobile device.
  • one way to avoid interrupts while consuming the data is to load everything before it is consumed.
  • the basic idea is to download new subjects to the device while the current subject is consumed.
  • the download time of additional subjects is restricted to the time a user needs to consume the current media subject.
  • the result is similar to streaming, but with improved flexibility for the user, and the added complexity of not knowing the next subject or the time the user will spend on the current subject.
  • the time to download a subject consists of:
  • the time for a request to go to the server and an empty result to go back is not dependent on the size of a subject. Neither is the time needed for the server to process the request given that the server is reasonable fast.
  • the caching time in the client has both a fixed and size dependent part.
  • the download time can be seen as a fixed time for each subject and a variable time dependent on the size. If the fixed part is a larger than the variable it is better trying to cache several subjects in one request to decrease the overhead time for each subject.
  • the load on the network or server has an impact on each client.
  • a mobile user changes carrier, for example from a GPRS connection to a radio LAN
  • the download times changes too.
  • the mobile device should adjust the expected download time accordingly by keeping statistics from earlier downloads.
  • expected bytes/second average (SizeN / DownloadtimeN) Consumption Time
  • the consumption time is the time the user is expected to spend at each subject.
  • Audio - given in the file format for example the length of an mp3-file, provided of course that the user does not fast forward etc .
  • Navigation mode 1 Navigation in a magazine can be done by using navigation buttons 2 on the PDA 1, intended for this purpose. This type of navigation is referred to as mode 1 navigation. In a typical case, which will be further described below, the PDA has four buttons 2a-d: forward 2a, backward 2b, up 2c and down 2d.
  • the PDA also has an automatic mode, in which the media player automatically continues to the next subject after a subject is consumed.
  • the "next" subject may be defined by a predetermined path through the magazine, either decided by the content provider or by user preferences.
  • Automatic mode can be regarded as a special case of mode 1 navigation.
  • the magazines should preferably be constructed so the typical consumer is happy with the predetermined path and only does a few explorations into interesting articles.
  • subject are cached in the PDA memory 3, and ideally a subject is cached just before the user navigates to it .
  • Selection process Fig 2 gives an example of a magazine structure with a currently consumed subject, 0__current 21. As mentioned above, it is possible to move in four directions: forward, backward, up and down. All the subjects that are reachable within two moves are shown in the structure, and are labeled l_ ⁇ direction> or 2_ ⁇ directionl>_ ⁇ direction2> .
  • up is assumed to lead to the "parent" subject 22, i.e. the subject on the closest more general level leading to the current subject 21.
  • up leads to the next subject 23 on the parent level, in which case the user does not need to revisit the subject 22, which has previously been visited.
  • the back direction normally indicates the previous subject on the same level, but when the first subject on a level is reached, back will lead to the parent. In the figure, this is illustrated by the fact that the parent subject 22 can be reached by pressing back twice
  • the magazines should therefore be designed so the average consumption time is larger than the download times.
  • the ratio between the average consumption time and the download time can be used as a measurement of how good a magazine is for caching.
  • Such a selection process not should be limited to subjects two steps away from the current subject. Rather, the selection should be made unbiased to all factors, in order to accomplish a dynamic caching of subjects resulting in a satisfying media experience. It might be the case that a 3-step subject is selected before a 2 -step subject, if the circumstances are such.
  • the subjects immediately next to the currently consumed subject should always be cached. After that, the priority is roughly inversely proportional to the distance from the current subject .
  • Time to consumption By adding all the consumption times for all the subjects on the path to a subject, the estimated time before that subject is needed can be computed. It can be realized that a subject that is "hidden" behind a closer subject with a long consumption time, can be given a low caching priority. It can instead be cached while this closer subject is being consumed.
  • Variables influencing the consumption may be defined by the user or the media content provider. Tagging by the media subjects may be used to enable the user to prioritize certain types of subjects. Links
  • a subject may relate to another subject, possibly in a different magazine, and that a direct link can be built into the structure .
  • Each criteria should have a weight, ie multiplication factor, attached to them. Depending on how the device is used, the weights should adjust to learn the user's behavior. By adding the criteria for each subject can the cache points can be calculated and the subject with the most cache points is the next one to be downloaded.
  • step 41 all subjects one step away from the current subject are cached. As mentioned above, this normally means maximum two new cached subjects.
  • the steps 42 and 43 are repeated for all subjects within N steps from the current subject (step 44) , and in step 45 the resulting priorities are ordered in a sorted list.
  • the value of N is dependent upon the available processing capacity, and indirectly the available memory.
  • step 46 it is checked if the subject with index j (the index j starting at the top of the list, with the subject with the highest priority) is already cached. If this is the case, the program control increases j by one (step 47) and returns to step 6 and performs the check for the following subject. However, if the subject is not cached, program control proceeds to step 48, where it is checked if there is enough cache memory available to cache the subject. If this is the case, the subject is cached (step 49) , and program control continues to step
  • step 47 where j is increased, and then returns to step 46 again.
  • step 51 it is checked if there are read subjects located at least a predefined distance "behind" the current subject. The direction "behind” is defined in a way so as to corresponding to areas of the structure that have been passed by the user. The distance should be greater than N steps, i.e. only subjects outside the prioritized list are cached out. If read subjects are found, one of these is cached out in step 52, and program control returns to step 48.
  • step 53 it is checked if there are unread subjects located at least a predefined distance behind the current subject (possibly different from the distance in step 50) . If so, one of these subjects is cached out in step 54, and program control returns to step 48. Otherwise, in step 55, the subject at the end of the list is cached out and program control returns to step 48.
  • step 42 It is sometimes advantageous to return all the way to step 42 each time a subject has been cached in or out, as this possibly results in a change in the factors determining the priority order.
  • a control is performed each time a subject is cached in or out, to find out if a return to step 42 is deemed necessary.
  • a third alternative may be to return to step 42 at regular intervals, e.g. every 4 cachings.
  • the memory will eventually be filled with the subjects with the highest priority as defined in step 43.
  • the process may be interrupted at any time, by the user initiating a move. Each time this happens, the program control restarts with step 41.
  • the PDA 1 intended for use with the Mediabrick TM concept may also have means for direct navigation, in the case shown in fig 1 with the use of a pointing device 7, such as a pen.
  • a pointing device 7 such as a pen.
  • the client is provided with means for determining which navigation mode is being used by the user, and to adapt the caching process to the navigation mode.
  • this is illustrated by a sensor 8, arranged to detect when the pen 7 is removed from the PDA 1.
  • the weights W1-W4 above are altered in order to increase the importance of e.g. user preferences and consumption patterns.
  • the result is a completely different caching strategy, albeit governed by the same process, outlined in figs 4-5. In certain cases, it might be considered to even cancel the step 41, i.e. to choose not to cache immediately neighboring subjects .

Abstract

L'invention concerne un procédé destiné à optimiser l'utilisation d'une capacité client lors de la fourniture de contenus d'informations à un utilisateur. Tout d'abord, deux modes de navigation du client sont définis: le premier, un mode de navigation continu caractérisé par un mouvement restreint dans les contenus, et le second, un mode discontinu caractérisé par un mouvement non restreint dans les contenus. Ensuite, on détermine quel mode de navigation l'utilisateur est en train d'utiliser, et l'utilisation de la capacité client est adaptée au mode de navigation utilisé. Dans le premier mode de navigation, l'action de l'utilisateur peut être plus facilement anticipée, et la capacité client peut être utilisée afin d'améliorer la consommation médiatique en cours. Dans le second mode de navigation, l'action de l'utilisateur est plus difficile à prédire, et la capacité client peut être nécessaire afin de gérer des actions inattendues.
PCT/EP2002/005006 2001-05-23 2002-05-07 Procede destine a optimiser l'utilisation d'une capacite client WO2002095619A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020037015227A KR100948446B1 (ko) 2001-05-23 2002-05-07 클라이언트 용량의 활용을 최적화하기 위한 방법
US10/478,366 US7743344B2 (en) 2001-05-23 2002-05-07 Method for optimizing utilization of client capacity
JP2002592011A JP2005513589A (ja) 2001-05-23 2002-05-07 クライアントのキャパシティの利用を最適化する方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP01112550.7 2001-05-23
EP01112550A EP1260914A1 (fr) 2001-05-23 2001-05-23 Procédé d'optimisation de l'utilisation de la capacité client

Publications (2)

Publication Number Publication Date
WO2002095619A2 true WO2002095619A2 (fr) 2002-11-28
WO2002095619A3 WO2002095619A3 (fr) 2003-02-13

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US (1) US7743344B2 (fr)
EP (1) EP1260914A1 (fr)
JP (1) JP2005513589A (fr)
KR (1) KR100948446B1 (fr)
CN (1) CN1304992C (fr)
WO (1) WO2002095619A2 (fr)

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WO2002095619A3 (fr) 2003-02-13
KR100948446B1 (ko) 2010-03-17
US20040201619A1 (en) 2004-10-14
CN1304992C (zh) 2007-03-14
JP2005513589A (ja) 2005-05-12
EP1260914A1 (fr) 2002-11-27
KR20040005980A (ko) 2004-01-16
CN1511293A (zh) 2004-07-07
US7743344B2 (en) 2010-06-22

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